bfd - SERP Analysis

https://en.wikipedia.org/wiki/Bidirectional_Forwarding_Detection

https://www.bfddrums.com/

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960xr/software/15-2_5_e/configuration_guide/b_1525e_consolidated_2960xr_cg/b_1525e_consolidated_2960xr_cg_chapter_0101010.pdf

https://www.dictionary.com/browse/bfd

https://cloud.google.com/network-connectivity/docs/router/concepts/bfd

https://bfd.mmseqs.com/

http://www.cisco.com/en/US/technologies/tk648/tk365/tk480/technologies_white_paper0900aecd80244005.html

https://971theeagle.iheart.com/featured/bfd/

https://www.dell.com/support/kbdoc/en-us/000218787/dell-networking-sonic-bidirectional-forwarding-detection-bfd

https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-networking-admin/bfd